fixed problem with custom scroll and getting value model in edit feature window

lib/assets/javascripts/cartodb/table/map/edit_feature_fields_dialog.js

@@ -23,31 +23,18 @@
       'string':   'String'
     },
 
-    render: function() {
-      cdb.ui.common.Dialog.prototype.render.call(this);
-      this.activeWizardOption(this.option);
-    
-      // Custom scroll code (showing gradients at the end and beginning of the content)
-      this.scroll = new cdb.admin.CustomScrolls({
-        parent: this.$('div.content'),
-        el:     this.$('div.content > div.wrapper')
-      });
-
-      this.addView(this.scroll);
-
-      return this;
-    },
-
     /**
      *  Render content
      */
     render_content: function() {
 
-      var $content      = $('<div>').addClass('wrapper')
+      var $content      = $('<div>').addClass('edit_content')
+        , $wrapper      = $('<div>').addClass('wrapper')
         , self          = this
         , schema        = this.options.table.get('schema')
         , hiddenColumns = this.options.table.hiddenColumns;
 
+
       _.each(this.model.attributes,function(val,attr){
         if (!_.contains(hiddenColumns,attr)) {
           // Get column type
@@ -67,13 +54,23 @@
           }, self)
 
           // Add to content
-          $content.append(subView.render().el);
+          $wrapper.append(subView.render().el);
 
           // Add subview to this view (cleaning purposes)
           self.addView(subView);
         }
       });
 
+      // Custom scroll code (showing gradients at the end and beginning of the content)
+      var scroll = new cdb.admin.CustomScrolls({
+        parent: $content,
+        el:     $wrapper
+      });
+
+      this.addView(scroll);
+
+      $content.append($wrapper);
+
       return $content;
     },
 
@@ -81,7 +78,8 @@
       // Get values from the subviews
       var new_model = {};
       _(this._subviews).each(function(v) {
-        new_model[v.model.get("attribute")] = v.model.get("value");
+        if (v.model && v.model.get('value'))
+          new_model[v.model.get("attribute")] = v.model.get("value");
       });
 
       // Set row model